As far as EPA is concerned that's true. However the state of
California might have additional ethanol blending requirements.

You can easily test this at a local pump next time you gas up your car.

wrote:
I am based in El Monte (KEMT). I notice in Los Angeles area, the
effective period is from Oct. 1 to Feb. 29. I know the only sure way
is to test before fill up. But does that mean no ethanol need to be
added from March 1 to Sept. 29?